Mercury 80 Owner's Manual

FUEL AND OIL
22
Filling Fuel Tank
!
WARNING
Avoid serious injury or death from a gasoline fire or explosion. Always stop the engine and do not smoke or
allow open flames or sparks in the area while filling fuel tanks.
Fill fuel tanks outdoors away from heat, sparks, and open flames.
Remove portable fuel tanks from boat to refill them.
Always stop engine before refilling tanks.
Do not completely fill the fuel tanks. Leave approximately 10% of the tank volume unfilled. Fuel will expand in
volume as its temperature rises and can leak under pressure if the tank is completely filled.
PORTABLE FUEL TANK PLACEMENT IN THE BOAT
Place the fuel tank in the boat so the vent is higher than the fuel level under normal boat operating conditions.
Engine Oil Recommendations
Mercury or Quicksilver NMMA FC-W certified synthetic blend 25W-40 multi-viscosity 4-Stroke Outboard Oil is
recommended for general, all-temperature use. If the recommended Mercury or Quicksilver NMMA FC-W
certified oil is not available, a major brand of NMMA FC-W certified 4-Stroke Outboard Oil of similar viscosity
may be used.
IMPORTANT: The use of non-detergent oils, multi-viscosity oils (other than Mercury or Quicksilver NMMA FC-
W certified oil or a major brand NMMA FC-W certified oil), synthetic oils, low quality oils or oils that contain solid
additives are not recommended.
C
+100
+80
+60
+40
+20
0
+38
+120
+49
+27
+16
+4
-7
-18
F
MERCURY 4-STROKE ENGINE OIL
OIL CAPACITY: 5.0L (5.3 U.S.qt.)
20862
Checking and Adding Engine Oil
IMPORTANT: Do not overfill. Tilt outboard out/up past vertical for approximately one minute to allow trapped oil
to drain back to the oil sump. Tilt outboard to vertical (not tilted) position when checking engine oil. For accurate
readings, check oil only when engine is cold or after engine has not run for at least an hour.
1. Before starting (cold engine) tilt outboard out/up past vertical to allow trapped oil to drain back to the oil
sump. Allow outboard to remain tilted for approximately one minute.
2. Tilt outboard to vertical operating position.
3. Remove the top cowl. Refer to Maintenance - Top Cowl Removal and Installation.
4. Pull out the dipstick. Wipe the dipstick end with a clean rag or towel and push it back in all the way.
5. Pull the dipstick back out again and observe the oil level. Oil should be in the operating range (cross
hatched region).

Mercury 80 Specifications

General

Brand	Mercury
Model	80
Category	Outboard Motor
Language	English